Spark-plug attachment



FILED MAY H, 1921- @earia'e J Patented Mar. 6, 1923.

PATENT OFFICE.

GEORGE T. W. OTTO, OF BALTIMORE, MARYLAND.

SPARK-PLUG ATTACHMENT.

Application filed May117,

To all whom it may con-oer-n':

Be it known that I, GEORGE T. \V. OTTO, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improve ments in Spark-Plug Attachments, of-which thefollowing is a specification.

This invention relates to a condenser attachmentfor the spark plugs ofinternal combustion engines, and it comprises a' SlIIlple and effectivecondenser structure which can be applied to any of the commercial formsof spark plugs now in use in a few moments, by simply placing it overthe insulated terminal of the plug and securing it in position with thefastening devices associated with the plug for connecting the wireterminal to the plug.

In the accompanying drawing, which illustrates the invention, I haveshown the spark plug inside View with my attachment in central verticalsection. a portion of the engine being also shown in section.

Referring to the drawing, (.4 represents a part of the cylinder head ofan internal combustion engine to which is fitted a spark plug Z) in theusual manner. The spark plug has the usual insulated terminal 1 and thegrounded terminal 2. The condenser c, which forms the subject of thepresent invention, comprises two condenser plates 3 and 4, preferablybell-shaped and the latter plate nested within the former and insulatedtherefrom by a layer of insulating material 5. The outer plate 3 has asmall central perforation 3*. adapting it to fit over the insulatedspark plug terminal 1, to which it becomes electrically and mechanicallyconnected by screwing down the nut (3, which is used to secure the hightension terminal '7 of the ignition system to the plug. The innerbell-shaped condenser plate 4 has a large central opening P so that thisplate will not engage any of the metal parts associated with theinsulated terminal of the plug. To this inner plate is secured a helicalspring 8,adapted to surround the plug and engage the metal of the engineadjacent the plug, inorder to ground said plate on the i921. Serial No.470,267.

This spring projects below thetensity of the spark in the spark gap willT be increased by the discharge of the condenser. l

What I claim is:

l A condenser attachment for the spark plugs of internal combustionengines comprising two metal plates insulated from one another. onehaving a perforation adapting it to fit on to the insulated terminal ofa spark plug and a spring connected to the other plate and adapted toengage a part on the engine adjacent the plug.

2. A condenser attachment for the spark plugs of internal combustionengines comprising two bell-shaped condenser plates. one fitting withinthe other and insulated therefrom, the outer plate having a perforationadapting it to fit on to the insulated terminal of a spark plug. and aspring attached to the inner member and adapted to eiligage a part onthe engine adjacent the p ug.

3. A condenser attachment for the spark plugs of internal combustionengines comprising two bell-shaped condenser plates, one fitting withinthe other and insulated therefrom, the outer plate having a perforationadapting it to fit on to the insulated terminal of a spark plug, and aspring attached to the inner member and adapted to encircle the plug andengage a part on the engine adjacent the plug.

In testimony whereof I aflix my signature.

GEORGE T. W. OTTO.

